The VPF406M3R8 from Cornell Dubilier is a Supercapacitor with Capacitance 40000 mF, Voltage Rating 3.8 V, Equivalent Series Resistance 250 to 550 mOhms, Temperature Operating Range -25 to 70 Degree C. Tags: Through Hole. More details for VPF406M3R8 can be seen below.